Sigefrid Thurgilsson

Sigefrid Thurgilsson (died 881) was a 9th century Danish Viking jarl from Northymbre.

Biography
Sigefrid Thurgilsson was the brother of Erik Thurgilsson, and the two of them became Vikings and headed to Northymbre in England to make their wealth. In 878, they took over York, and, after they left Haesteinn in command of York as they campaigned in Scotland, the Anglo-Saxon Christians of York ousted the Danes. Sigefrid also campaigned in Francia, where he launched raids on the Frankish kingdom. In 881, the sons of Thurgil captured London, and they captured King Alfred the Great's daughter Aethelflaed, who fell in love with Erik. During the final battle with the Mercians, Sigefrid killed Erik for attempting to abscond with Aethelflaed, who avenged Erik by stabbing Sigefrid through the heart.